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Comcast Speed Tweak Help


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#1 maw1048

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Posted 09 September 2006 - 11:39 AM

First of all, thanks in advance to any of you that can help me.  I really appreciate whatever help I can get. 

Below is my current information.

1.  Operating System
Windows XP Professional with SP2

2.  Internet Service Provider
Comcast - 6000 / 786

3.  Tweak Programs
I've installed CableNut and TCPOptimizer

SpeedGuide.net TCP/IP Analyzer

TCP properties for IP = XX.XXX.XXX.XX ()
Browser/OS = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727)
Notes: Read the Analyzer FAQ if the above is not your IP address.

TCP options string = 020405b40103030401010402

MTU = 1500
MTU is fully optimized for broadband.

MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.

Default TCP Receive Window (RWIN) = 749568
RWIN Scaling (RFC1323) = 4 bits (scale factor of 8)
Unscaled TCP Receive Window = 46848

For optimum performance, consider changing RWIN to a multiple of MSS.
Other RWIN values that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)

bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 29982.72 kbps (3747.84 KBytes/s) @ 200ms
Your TCP Window limits you to: 11993.088 kbps (1499.136 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 49 hops
TTL value is ok.

Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349) = 00100000 (32)
Precedence (priority) = 001 (priority)
Delay = 0 (normal delay)
Throughput = 0 (normal throughput)
Reliability = 0 (normal reliability)
Cost = 0 (normal cost)
Check bit = 0 (correct, 8th checking bit must be zero)

DiffServ (RFC 2474) = CS1 001000 (8) - class 1 (RFC 2474). Similar forwarding behavior to the ToS Precedence field.

4.  Speed Test Results

Download Stats
Download Connection is:: 2943 Kbps about 2.94 Mbps (tested with 2992 kB)
Download Speed is:: 359 kB/s
Tested From:: http://testmy.net/ (Server 1)
Test Time:: 2006/09/09 - 11:16am
Bottom Line:: 51X faster than 56K 1MB Download in 2.85 sec
Tested from a 2992 kB file and took 8.328 seconds to complete
Download Diagnosis:: May need help : running at only 53.43 % of your hosts average (comcast.net)
D-Validation Link:: http://testmy.net/stats/id-OJW27ZAK3
User Agent:: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727) [!]

------  Web100 Detailed Analysis  ------
Cable modem/DSL/T1 link found.
Link set to Full Duplex mode
Information: throughput is limited by other network traffic.
Good network cable(s) found
Normal duplex operation found.

Web100 reports the Round trip time = 54.16 msec; the Packet size = 1460 Bytes; and
There were 8 packets retransmitted, 108 duplicate acks received, and 111 SACK blocks received
The connection was idle 0 seconds (0%) of the time
This connection is network limited 99.97% of the time.

Web100 reports TCP negotiated the optional Performance Settings to:
RFC 2018 Selective Acknowledgment: ON
RFC 896 Nagle Algorithm: ON
RFC 3168 Explicit Congestion Notification: OFF
RFC 1323 Time Stamping: OFF
RFC 1323 Window Scaling: ON
Packet size is preserved End-to-End
Server IP addresses are preserved End-to-End
Information: Network Address Translation (NAT) box is modifying the Client's IP address
Server says [XX.XXX.XXX.XX] but Client says [192.168.0.100]

WEB100 Kernel Variables:
Client: localhost/127.0.0.1
AckPktsIn: 1128
AckPktsOut: 0
BytesRetrans: 11680
CongAvoid: 1002
CongestionOverCount: 0
CongestionSignals: 6
CountRTT: 1013
CurCwnd: 23360
CurMSS: 1460
CurRTO: 260
CurRwinRcvd: 749568
CurRwinSent: 16304
CurSsthresh: 10220
DSACKDups: 0
DataBytesIn: 0
DataBytesOut: 4171220
DataPktsIn: 0
DataPktsOut: 2857
DupAcksIn: 108
ECNEnabled: 0
FastRetran: 6
MaxCwnd: 45260
MaxMSS: 1460
MaxRTO: 280
MaxRTT: 130
MaxRwinRcvd: 749568
MaxRwinSent: 16304
MaxSsthresh: 21900
MinMSS: 1460
MinRTO: 240
MinRTT: 40
MinRwinRcvd: 46848
MinRwinSent: 16304
NagleEnabled: 1
OtherReductions: 0
PktsIn: 1128
PktsOut: 2857
PktsRetrans: 8
X_Rcvbuf: 103424
RcvWinScale: 7
SACKEnabled: 3
SACKsRcvd: 111
SendStall: 0
SlowStart: 9
SampleRTT: 60
SmoothedRTT: 60
X_Sndbuf: 103424
SndWinScale: 4
SndLimTimeRwin: 0
SndLimTimeCwnd: 10063220
SndLimTimeSender: 2863
SndLimTransRwin: 0
SndLimTransCwnd: 1
SndLimTransSender: 1
SndLimBytesRwin: 0
SndLimBytesCwnd: 4171220
SndLimBytesSender: 0
SubsequentTimeouts: 0
SumRTT: 54860
Timeouts: 0
TimestampsEnabled: 0
WinScaleRcvd: 4
WinScaleSent: 7
DupAcksOut: 0
StartTimeUsec: 268758
Duration: 10068646
c2sData: 2
c2sAck: 2
s2cData: 9
s2cAck: 3
half_duplex: 0
link: 100
congestion: 1
bad_cable: 0
mismatch: 0
spd: 0.00
bw: 4.49
loss: 0.002100105
avgrtt: 54.16
waitsec: 0.00
timesec: 10.00
order: 0.0957
rwintime: 0.0000
sendtime: 0.0003
cwndtime: 0.9997
rwin: 5.7188
swin: 64.0000
cwin: 0.3453
rttsec: 0.054156
Sndbuf: 8388608
aspd: 9.34515

Checking for mismatch on uplink
(speed > 50 [0>50], (xmitspeed < 5) [0.44<5]
(rwintime > .9) [0>.9], (loss < .01) [0.00<.01]
Checking for excessive errors condition
(loss/sec > .15) [2.10>.15], (cwndtime > .6) [0.99>.6],
(loss < .01) [0.00<.01], (MaxSsthresh > 0) [21900>0]
Checking for 10 Mbps link
(speed < 9.5) [0<9.5], (speed > 3.0) [0>3.0]
(xmitspeed < 9.5) [0.44<9.5] (loss < .01) [0.00<.01], (mylink > 0) [3.0>0]
Checking for Wireless link
(sendtime = 0) [3.0E=0], (speed < 5) [0<5]
(Estimate > 50 [4.49>50], (Rwintime > 90) [0>.90]
(RwinTrans/CwndTrans = 1) [0/1=1], (mylink > 0) [3.0>0]
Checking for DSL/Cable Modem link
(speed < 2) [0<2], (SndLimTransSender = 0) [1=0]
(SendTime = 0) [3.0E-4=0], (mylink > 0) [3.0>0]
Checking for half-duplex condition
(rwintime > .95) [0>.95], (RwinTrans/sec > 30) [0>30],
(SenderTrans/sec > 30) [0.1>30], OR (mylink <= 10) [3.0<=10]
Checking for congestion
(cwndtime > .02) [0.99>.02], (mismatch = 0) [0=0]
(MaxSsthresh > 0) [21900>0]

estimate = 4.49 based on packet size = 11Kbits, RTT = 54.16msec, and loss = 0.002100105
The theoretical network limit is 4.49 Mbps
The NDT server has a 8192.0 KByte buffer which limits the throughput to 1181.77 Mbps
Your PC/Workstation has a 732.0 KByte buffer which limits the throughput to 105.59 Mbps
The network based flow control limits the throughput to 6.37 Mbps

Client Data reports link is 'T1', Client Acks report link is 'T1'
Server Data reports link is '10 Gig', Server Acks report link is 'Ethernet'

Tracert and Ping program Results

The current date is: Sat 09/09/2006
The current time is: 12:11:57.15

Microsoft Windows XP [Version 5.1.2600]

Pinging testmy.net [67.18.179.85] with 32 bytes of data:

Reply from 67.18.179.85: bytes=32 time=34ms TTL=50
Reply from 67.18.179.85: bytes=32 time=54ms TTL=50
Reply from 67.18.179.85: bytes=32 time=34ms TTL=50
Reply from 67.18.179.85: bytes=32 time=34ms TTL=50
Reply from 67.18.179.85: bytes=32 time=33ms TTL=50
Reply from 67.18.179.85: bytes=32 time=40ms TTL=50
Reply from 67.18.179.85: bytes=32 time=40ms TTL=50
Reply from 67.18.179.85: bytes=32 time=42ms TTL=50
Reply from 67.18.179.85: bytes=32 time=1220ms TTL=50
Reply from 67.18.179.85: bytes=32 time=44ms TTL=50
Reply from 67.18.179.85: bytes=32 time=47ms TTL=50
Reply from 67.18.179.85: bytes=32 time=36ms TTL=50

Ping statistics for 67.18.179.85:
    Packets: Sent = 12, Received = 12, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:
    Minimum = 33ms, Maximum = 1220ms, Average = 138ms


Ping Complete.

Tracing route to testmy.net [67.18.179.85]

over a maximum of 30 hops:

  1    1 ms    1 ms    1 ms  192.168.0.1
  2    *        *        *    Request timed out.
  3    *        *        *    Request timed out.
  4    *        *        *    Request timed out.
  5    *        *        *    Request timed out.
  6    *        *        *    Request timed out.
  7    *        *        *    Request timed out.
  8    *        *        *    Request timed out.
  9    *        *        *    Request timed out.
10    *        *        *    Request timed out.
11    *        *        *    Request timed out.
12    *        *        *    Request timed out.
13    *        *        *    Request timed out.
14    *        *        *    Request timed out.
15    *        *        *    Request timed out.
16    33 ms    31 ms    31 ms  55.b3.1243.static.theplanet.com [67.18.179.85]

Trace complete.

5. Uninstalled all the protocols there that were not needed.

6. IE.....Nothing there is checked.

7. NIC Card....Everything is up to date.

8. Done...Power cycle your modem, unplug it for at least 3 minutes

9. Done...Download, update, and do a scan with SpyBot and Ad Aware to remove any spyware

10. Do not use ZoneAlarm

11. Use Windows firewall

12. Done....I have AVG

13. All updates have been applied.

14. Done.....Download and run CCleaner

15. Currently using 6000 768, but don't know from what version of Van Buren.  Which file should I be using?

16.  I have not built my own file.  I don't know that much about it.

#2 FallowEarth

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Posted 09 September 2006 - 01:51 PM

Microsoft Windows XP [Version 5.1.2600]

Pinging testmy.net [67.18.179.85] with 32 bytes of data:

Reply from 67.18.179.85: bytes=32 time=34ms TTL=50
Reply from 67.18.179.85: bytes=32 time=54ms TTL=50
Reply from 67.18.179.85: bytes=32 time=34ms TTL=50
Reply from 67.18.179.85: bytes=32 time=34ms TTL=50
Reply from 67.18.179.85: bytes=32 time=33ms TTL=50
Reply from 67.18.179.85: bytes=32 time=40ms TTL=50
Reply from 67.18.179.85: bytes=32 time=40ms TTL=50
Reply from 67.18.179.85: bytes=32 time=42ms TTL=50
Reply from 67.18.179.85: bytes=32 time=1220ms TTL=50
Reply from 67.18.179.85: bytes=32 time=44ms TTL=50
Reply from 67.18.179.85: bytes=32 time=47ms TTL=50
Reply from 67.18.179.85: bytes=32 time=36ms TTL=50

Ping statistics for 67.18.179.85:
    Packets: Sent = 12, Received = 12, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:
    Minimum = 33ms, Maximum = 1220ms, Average = 138ms


Ping Complete.


Reply from 67.18.179.85: bytes=32 time=1220ms TTL=50

You see that this ping has significantly higher times than the others, showing that you've got some latency happening somewhere along the line.

Tracing route to testmy.net [67.18.179.85]

over a maximum of 30 hops:

  1     1 ms     1 ms     1 ms  192.168.0.1
  2     *        *        *     Request timed out.
  3     *        *        *     Request timed out.
  4     *        *        *     Request timed out.
  5     *        *        *     Request timed out.
  6     *        *        *     Request timed out.
  7     *        *        *     Request timed out.
  8     *        *        *     Request timed out.
  9     *        *        *     Request timed out.
10     *        *        *     Request timed out.
11     *        *        *     Request timed out.
12     *        *        *     Request timed out.
13     *        *        *     Request timed out.
14     *        *        *     Request timed out.
15     *        *        *     Request timed out.
16    33 ms    31 ms    31 ms  55.b3.1243.static.theplanet.com [67.18.179.85]

Trace complete.


Your router is not allowing ICMP traffic.  You should be able to enable this in the administration page of the router.  You should be able to access this by typing 192.168.0.1 into the address bar of your browser.  If not, I would suggest bypassing your router and running another ping, traceroute, and speedtest.  It may be that your router is slowing you down.

#3 maw1048

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Posted 10 September 2006 - 07:21 AM

Looks like it was my router slowing me down.

I connected to the cable modem directly and got great speed tests.

:::.. Download Stats ..:::
Download Connection is:: 6690 Kbps about 6.69 Mbps (tested with 12160 kB)
Download Speed is:: 817 kB/s
Tested From:: http://testmy.net/ (Server 1)
Test Time:: 2006/09/10 - 7:17am
Bottom Line:: 117X faster than 56K 1MB Download in 1.25 sec
Tested from a 12160 kB file and took 14.89 seconds to complete
Download Diagnosis:: Awesome! 20% + : 21.39 % faster than the average for host (comcast.net)
D-Validation Link:: http://testmy.net/stats/id-SW7FUL1TY
User Agent:: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727) [!]

I couldn't figure out how to enable ICMP traffic.  I looked trhough all the admin pages of the browser, but didn't see an option to enable ICMP traffic.  Will there be an option that says, Enable ICMP traffic?

Since it's my router slowing me down, is there any router tweaks / settings I can change so that it doesn't slow down my connection as much?

#4 xgsx

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Posted 29 September 2006 - 12:52 PM

What make/model router do you have?




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